feat: add Yaltopia logo to email header

Made-with: Cursor

src/email/BaseEmailShell.tsx

@@ -40,7 +40,13 @@ export function BaseEmailShell({
       <div className="email-shell">
         <header className="email-header">
           <div className="brand-lockup">
-            <div className="brand-mark">Y</div>
+            <div className="brand-mark">
+              <img
+                src="/YaltopiaHomesLogo.svg"
+                alt="Yaltopia Home"
+                className="brand-logo"
+              />
+            </div>
             <div className="brand-text">Yaltopia Home</div>
           </div>
           <div className="email-tag">{categoryLabel[category]} notice</div>

src/email/email.css

@@ -47,8 +47,13 @@ body {
   display: flex;
   align-items: center;
   justify-content: center;
-  font-size: 18px;
-  font-weight: 700;
+  overflow: hidden;
+}
+
+.brand-logo {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
 }
 
 .brand-text {